Quarterly report pursuant to Section 13 or 15(d)

Warrants (Schedule Of Fair Value Of Warrants Issued) (Details)

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Warrants (Schedule Of Fair Value Of Warrants Issued) (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Class of Warrant or Right [Line Items]    
Fair value $ 3,391,439 $ 7,853,635
July 2013 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value   8,762
October 2013 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value   26,288
January 2014 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value   29,257
November 2015 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value 405,249 1,260,050
November 2015 Placement Agent Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value 802 2,936
March 2016 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value 257,519 697,554
September 2016 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value 482,598 1,054,083
June 2017 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value 880,653 1,981,864
June 2017 Placement Agent Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value 93,251 221,591
October 2017 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value 1,144,975 2,305,552
October 2017 Placement Agent Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value $ 126,392 $ 265,698